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针对惯导系统中应用较为成熟的RS232、RS422、RS485、CAN等数据传输方法传输带宽低、可靠性低、距离近并且引入电磁干扰等问题,将基于IEEE.1394b的光通信引入惯导系统。利用惯导系统中FPGA资源配合物理层芯片和光电转化模块,搭建基于IEEE-1394b的数据传输系统。详细介绍了各个模块的工作流程,为满足数据传输特殊需求对链路层请求方式和数据包进行惯导专用化改进。借助QuartusⅡ集成开发环境提供的SignalTapⅡ逻辑分析仪进行验证。结果表明,数据传输系统可以使用立即请求发送广播形式的异步数据包,也可以进行点对点异步数据传输,实现了预期目标。该方法不仅屏蔽了惯性导航系统的外界电磁干扰,还实现了惯导系统的大带宽、高可靠传输,具有很高的工程应用价值。
Aiming at the problems of low data transmission bandwidth, low reliability, close distance and the introduction of electromagnetic interference in data transmission methods such as RS232, RS422, RS485 and CAN which are more mature in INS, the IEEE.1394b-based optical communication is introduced into INS. Using the FPGA resources of inertial navigation system to cooperate with physical layer chip and photoelectric conversion module, a data transmission system based on IEEE-1394b is built. The work flow of each module is introduced in detail. In order to meet the special requirement of data transmission, the link layer request mode and the data packet are improved by inertial navigation. Verify with the SignalTap II logic analyzer provided by the Quartus II Integrated Development Environment. The results show that the data transmission system can use the immediate request to send broadcast forms of asynchronous data packets can also be point-to-point asynchronous data transmission, to achieve the desired goal. The method not only shields the external electromagnetic interference of the inertial navigation system, but also realizes the large bandwidth and high reliable transmission of the inertial navigation system, and has high engineering application value.